When the boiler is drained regularly, is it necessary to stop adding water?

During regular blowdown of the boiler, water supply is generally required to be stopped. During the waste discharge process, the water inside the boiler is removed; if water is added at the same time, it may cause the water level to exceed the designed standard and even lead to overflow. Therefore, during sewage discharge, water supply should be stopped first, and water supply resumed only after the discharge is complete, in order to maintain a balanced and stable water level inside the boiler. .

1. To ensure that the water quality in the boiler’s water is in line with specified standards and to keep impurities in the boiler water within acceptable limits, it is necessary to continuously remove from the boiler the water containing high levels of salts and alkalis, as well as any sedimented sludge and loose precipitates. This process is known as boiler blowdown. 2. Waste discharge method: Boiler waste discharge is divided into continuous discharge and periodic discharge. Continuous drainage, also known as surface drainage, involves the continuous removal of a portion of the boiler water from the area where the salt and alkalinity levels are highest, in order to reduce the amounts of salts, alkalis, silicic acid, as well as suspended debris in the boiler water. Therefore, the continuous drainage pipes are installed at a depth of 80–100 mm below the normal water level. Periodic drainage is used primarily to remove deposits such as sludge and dirt from within the boiler, and thus its drainage outlets are usually located at the bottom of the boiler drum and at the bottom of the header. The regular blowdown process is short in duration, and it should be carried out when the boiler is at a high water level, under low load, or when it is shut down. On small boilers, regular blowdown is usually the only type installed. In summary, normal water makeup should be carried out when the boiler is drained.

No, the boiler feed water pump must not be stopped! It’s pointless to stop feeding water into the boiler. Steam supply during blowdown is proceeding normally; if the valves do not close properly (although there are two valves in series for blowdown), it will be a disaster as the water level in the boiler drum cannot be maintained. The scheduled production time is short, and the quantity is also small. Stopping and restarting the pump (or closing the water supply valve) causes significant damage to the pump, motor, and piping system. Those working with boilers are advised to read this book, \"Boiler Operator’s Handbook\".